package com.alibaba.org.service.impl;



import com.alibaba.basic.service.impl.BaseServiceImpl;
import com.alibaba.org.domain.Department;
import com.alibaba.org.mapper.DepartmentMapper;
import com.alibaba.org.service.IDepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements IDepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;

    @Override
    public void add(Department department) {
        // 没选上级部门
        // Department(manager_id=337, manager=null,parent_id=null,parent=null,children=[];
        // 选了上级部门
        // Department(manager_id=337, manager=null,parent_id=4,parent=null,children=[];
        // 选了上级部门之后叉掉
        // Department(manager_id=336, manager=null,parent_id=null,parent=null,children=[];
        // 添加之后返回一个自增长ID
        departmentMapper.save(department);

        // 添加的时候对dirPath的处理
        String dirPath="";
        if(department.getParent_id()==null){ // 没有选择上级部门 or // 选了之后x掉
            // 获取自增长id
            Long id = department.getId();
            dirPath="/"+id;
        } else {
            // 获取上级部门
            Long parent_id = department.getParent_id();
            // 获取上级部门的dirPath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            dirPath=parentDirPath + "/" + department.getId();
        }
            department.setDirPath(dirPath);
            departmentMapper.update(department);

    }

    @Override
    public void update(Department department) {
        // 添加的时候对dirPath的处理
        String dirPath="";
        if(department.getParent_id()==null){ // 没有选择上级部门 or // 选了之后x掉
            // 获取自增长id
            Long id = department.getId();
            dirPath="/"+id;
        } else {
            // 获取上级部门
            Long parent_id = department.getParent_id();
            // 获取上级部门的dirPath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            // 拼接新的上级部门路径
            dirPath=parentDirPath + "/" + department.getId();
        }
        department.setDirPath(dirPath);
        departmentMapper.update(department);
    }


    @Override
    public List<Department> deptTree() {
       // 1. 一次性查询出所有数据，放到内存中，可以使用map
       // 2. 从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
       // 3. 遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = departmentMapper.loadAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParent_id() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                //2.将自己装到  父部门 的children中
                parentDepartment.getChildren().add(department);
            }
        }
        return deptTree;
    }

}
